A boog is the same thing as a booger, with one exception. It's called a booger while it still resides in the nostril. Once it passes the outer nostril, it becomes a boog. Like if someone shoots a snot rocket and you see the offending glob stuck on the television screen, at that point it becomes a boog. Or if yer talking to your date but you can't pay attention to whatever the hell shes blabbering about because shes got this inch long nose nugget flappin out of her nostril, its not quite technically a boog yet, because its still attached to the inside of her nose, but once you grab that badboy out of her nose and wipe it on her forehead, THEN its a boog. Understand? Cool.

1) Hey babe, be a doll and wipe that nasty boog off yer face whydontcha!